Automatic two-way plow



Nov. 2o, 1951v H, ROGERS ETAL 2,575,428

AUTOMATIC Two-WAY PLOW Fi1ed March 12, 1945 a sheets-.sheet 1 [NVM/Tops HARRY Foa-Ps WML/AM 55K MfLL/V Foz T45/ HEM ArToe/vn/s Nov. 20, 1951 H. ROGERS ETAL 2,575,428'

AUTOMATIC Two-WAY PLOW Filed March 12, 1945 5 sheets-'sheet 2 [NVENToes HAPPY Postes M44 mM F/Is/K A75/.LEN

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FOQ 7F15 HEM .Arme/urns Nov. 2o, 1951 H. ROGERS ETAL 2,575,428

AUTOMATIC TWO-WAY PLOW Filed March l2, 1945 jrg@ 2 [H120 5 sheets-sheet 5 IN VEA/roes f Hneey Fosses l WML/4M fis/r M5L/.EN

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We THE H2M l v v.rToeA/fr Patented Nov. 20, 1951 AUTOMATIC TWO-WAS.7 PLOW Harry Rogers, Bakersfield,` and William Fisk `Mellen, Whittier, Calif.; said Mellen assignor to Alice Marian Mellen, Whittier, Calif.

Application March 12, 1945, Serial No. 582,314

22 Claims. l

This invention relates to plow structures and more particularly to plows adapted to be drawn by powered vehicles such as tractors, and wherein the plows are mounted for movement to and from operative position.

In the more specific aspect, this invention relates to two-way plows in which pairs of plow bottoms, which are usually referred to herein simply as plows, are mounted for selective movement to and from operative position in.' a

changed so that the newly plowed furrow may@ be thrown in the same direction as when the plowing structure was oppositely drawn.

A principal object of this invention is to provide a two-way plowing structure employing oppositely pitched plows by means of which the plow-controlling mechanisms may be tripped in order to reverse the plows automatically through actuation of a power operated control commonly found upon tractors employed for such purposes and being usually in the form of a hydraulic lift.

It is a further object of the invention to provide a two-way plow structure by which operation of the hydraulic control or other powered control to lift the plow structure will cause one plow to be automatically lifted and the other plow to be automatically lowered.

A still further object of the invention is to provide means for automatically reversing the relative positions of the plows in a two-way plowing structure such that, by one actuation of the power lift to lift the plowing structure bodily, the mechanism for raising one of the plows relative to the other will be actuated on the lifting stroke, such mechanism being tripped to inoperative position so that on the next actuation of the power lift mechanism to lift the other plow the lifting mechanism for the rst mentioned plow which had been previously lifted will not function. It is also an object of the invention to provide means which will again trip mechanism which had previously been tripped into inoperative position, so that on a subsequent excursion of the mechanism lifted by the power lift, the lifting mechanism will be restored to operative condition.

It is a particular object of the invention to employ a supporting frame, commonly used in the farm implement industry and known as an A-frame, as a support for the two-way plow structure of this invention, and to connect the automatic plow-shifting mechanism with the A- frame, the A-frame being actuated by the con- Ventional or other hydraulic power lift, and to employ relatively stationary trip means or restraining means carried by the tractor or other draft implement to serve as an actuating or control mechanism for the plow-shifting mechanism as the A-frame is raised and lowered by the power lift.

A particular feature of the invention is found in the combination of a lever or lifting arm system which is connected with the A-frame structure upon which the two-way plows are mounted, this lifting arm system including joined levers, one arm of each of which constitutes a lifting arm, the outer end of which remote from the respective lever joint is equipped with means adapted to engage with a relatively stationary restraining means and adapted to be tripped at certain positions of the lifting arms to provide for or to avoid lifting engagement therewith. More broadly, the invention includes any mounting of the lifting arms with respect to the A-frame and the relatively stationary means such that relative movement between the A-frame and the relatively stationary means results in restraining one portion of the respective lifting arm while moving another portion thereof to accomplish elevation of the respective plow. In a preferred construction, the two plows are interconnected by means of a cable whereby they are counterbalanced so that one plow descends as the other plow is raised.

'Other particular features of the invention relate to means for adjusting the plows at various angles as required, means for varying the suck of the plows when in operative position and with respect to varying operative conditions, and means for mounting and controlling a colter disk or similar earth-penetrating tool which serves to slice the earth in advance of the point of the operating plow.

Other objects and features of the invention will be apparent to those skilled in the art upon reference to the following specifications and to the accompanying drawings wherein certain embodiments of the invention are disclosed for the purpose of illustration.

In these drawings,

Fig. 1 is a perspective View of a two-way plow embodying the features of the present invention, its general relationship to a tractive vehicle ernploying power lift mechanism being indicated;

Fig. 2 is a side elevation corresponding in general with the perspective view of Fig. l, the relation of the two-way plow construction and its automatic shifting mechanism to a hydraulic power lift on a tractor being shown in greater detail;

Fig. 3 is a front elevation, approximately as indicated by the line 3-3 of Fig. 2, the elevated plow being omitted for the purpose of greater clarity;

Fig. 4 is a horizontal detail taken approximately from the line 4 4 of Fig. 2;

Fig. 5 is a face elevation of one member of an adjustable joint viewed approximately from the line 5 5 of Fis. 4;

Figs. 6 and 7 are respectively diagrammatic elevations representing two Successive stages in the raising of one plow and the lowering of another;

Fig. 8 is an enlarged side elevational detail showing the relation of the parts,. including a tripping mechanism, at the commencement-of a Alifting operation where the parts are at a stage somewhat earlier than that indicated by Fig. 6; Fig. 9 is a front elevational detail of the parts 'in the positions indicated in Fig. 8;

Fig. 10 is a side elevational detail, taken from the opposite side of that of Fig. 8, and indicating the operation of the trip mechanism to project the lifting mechanism out of lifting position; and

Fig. 1l is a cross-sectional detail, taken approximately on the line H-H of Fig. 8.

Inv the drawings, the rear housing I5 of a tractor I5 is indicated in broken lines. To opposite sides of the housing l5 two lifting arms I8 are provided, their forward ends being pivoted at I9 upon the housing i5. The rearward ends of the arms iS serve to support the lower end of an A-fraine whose upper end has connected thereto as by means of a bolt 2l a posil tioning arm 22, the forward end of which is connected with the tractor housing ilithrough a part 23 which may be an automatic control conventionally employed on some tractors for adjusting the A-frame 23' or similar framework in accordance with the pull or thrust on the positioning arm 22. The lifting arms I8 Yare controlled by means oi lifting links 24 whose lower ends are connected respectively to middle portions of the arms i8 and whose upper ends are connected to the outer ends of a forked bell crank 25 pivoted on the housing i5 as by means of a rock shaft 28, the upper arm 21 of the bell crank 25 being connected with a hydraulic lift mechanism 28 under the control of the operator of the tractor I6.

The A-frame 20 comprises two bent side members 39 whose lower portions diverge to assume positions respectively adjacent the rear ends of the lifting arms i8, the members 30 of the A-frame 2i! being supported on the arms I8 through the medium of a transverse shaft 3l extending through the adjacent extremities of the members 3e and the arms if, and being conveniently secured in any appropriate manner as through Cotter keys 32 and nuts 32a.

The shaft Si at the lower end of the A-frame 2G carries plow beams 33.121 the form of I-beams whose lower ends are curved downward and support conventional plow bottoms Se which are herein called plows and which include vthe usual mold boards 35 and landsides 3ft, the whole in each instance being secured to the -beam 33 by appropriategattaching means 31.

The forward portion of each of the beams 33 is divided, the two parts being connected by adjusting joints lill. The forward extremity of each I-beam 33 is carried upon a mounting positioned upon the respective end of the shaft 3l, each mounting comprising a lower retaining plate l2 and an upper bearing plate it clamped or welded upon a ltube l5 through which the shafts! extends. The clamping of the plates 42 and 44 is accomplished through the medium of a plurality of bolts l which also bind upon the top of therespective beam 33 a tie plate 4B whereby to anchor the beam 33 and it's plow 3d in adjusted position. Bodily adjustment laterally isaccomplishedthrough the medium of slots (Figs. 1 and 4) in the plates 42 and 4G. At the same time, the beams 33 may be offset laterally merely by a slight twist which will be permitted by the play provided for each beam 33 between the bolts 46. In order to change the cant of the plowsfil, arotary adjustment;maybe accomplished through the medium of the respective joints lill: Each joint 4B comprisestwoparts 52 weldedat 53 to the respective. portions .ofl the beam 33, and adjustment is, accomplished; by means Vof serrations .5d with which the-opposing faces. of thejoint partsl 52 are provided. The` joint parts eTZiare also .provided with radially opposed arcuate slots 55 .in which bolts mirare-mounted andby which the parts are bound in-adjusted position.

The rear portion of `each of the I-beams33tadjacent the top ofthe downwardly extending curve has one endl: of a cable 58 attached thereto through the medium .of aneye 591 positioned on the upper edge of the beam, clamps 60 vbeing employed to secureV the. cable ends in the eyes 59. The intermediate portion of the cable `58.*passes through a pulley, Eli which is mounted in any suitable retainer such as a clevis 62 carried by a cross bolt 63 extending through theupper ends of the members d of 'the A-frame 20.

Each of the :I-beams shasconnected thereto, at aposition adjacent the.A respective eye 59, the

, lower end ofv a jointed lever 50, which serves both as a lifting means for the respective plow to raise it into elevated` position and to brace 'it invlowered operative position. Each'lever vtill comprises an elongated section inthe form-.cfa lifting lever arm A55 which, is connected by-a pivot 'between adjacentendsof two'spaced members vforming a connecting link 61. Securedto the underedges of the members of each linke] and spanning the space between them'.- is-astop GSi-adapted to be .engagedl by an adjacent extremity. 65a ofthe respective lever arm S5. to retain the latter just past" deady center when the Vrespective lever Se is in ilowered or bracingV position. The lowermost end of each link,` El' is .connected by means of fa pivot bolt -691to an ear lil secured to the top of the respective I-beam 33 whereby the linlrl '.'i is pivoted upon the beam. v For thepurpose of adjusting the end of each linlrl' with; respect'to-its beam 33whereby to vary the-length ofthe lever Ell as a whole andtherelo-yV adjust the vamount .of suck of the plowwhenin operative position, a plurality of holes I2-is provided for selective receptionof the! respective bolt-69.v In order to maintain the spacingof the membersof each linkt?, a spacer ybar 'i3 Aprovided therebetween.

varreglan properly retained by means of suitable and spacers 16 as may be required. I 1

Thus, when a plow is in lowered position, as indicated in the lvarious figures, the respective jointed lever 64 serves to brace that plow, and when a plow is in elevated position the respective jointed lever 64 is folded about its pivot 65, such a position being attained with any operation serving to raise the respective plow. Such a plowlifting effect is attained by means of an influence which serves to swing the respective lifting lever arm 65 about the pivot provided by the pivot bolt 14, and in the present construction this is accomplished by relatively depressing the end of the respective lifting arm A|55 which extends beyond the pivot bolt 14. Thev operation off the two lifting arms 65 to elevate their respective plows 34 is accomplished by means of corresponding trip mechanisms, which comprise trip arms 89, which act as restraining means at certain stages of actuation of the parts, and latch means constituting elevators generally indicated at 8|. The trip arms 80, which are shown in the form of angular brackets, constitute part of a frame structure in connection with a transverse support 82 secured to the rear of the tractor housing 5 and to which the trip arms 80 are connected by means of pivots 83. Each trip arm 80 is in the form of a T-iron and each elevator 8| includes a slide 84 travelling upon the head 80a of the respective T-iron, each slide 84 being held around the respective head 80a by means of overhangingV guide flanges 84a. The outside wall or back of each slide 84 is provided with ears 85 which carry a transverse pivoting bolt or pin 86 which engages in an aperture in the extremity of a corresponding end portion 65h of the respective lifting arm '85. On the upper end of each slide 84, there is mounted Aa latch 81 which comprises a pair of converging links 81a, lying on opposite sides of the respective trip arm 80 and having their upper ends pivoted to the slide 84 by a pivot pin 88. Each latch 81 includes also a transverse detent 90 carried between the lower converging ends of the links 81a, as best seen in Figs. 9 and 1l. These detents 90 are adapted to engage under a shoulder 9| formed by a notch cut in the nuts 15 forward edge ofthe main web of the T-iron constituting each of the trip arms 80, each notch providing a relatively inclined face 92 along which the respective detent 90 may travel under certain conditions.

The position of each slide 84 on its trip arm 80 is controlled in part by the respective-shoulder 9| and in part by the movement of the adjacent end 65h of the respective lifting arm 65. In the form shown, each arm end 65h is offset upward above the center line of its lifting arm 65 for the purpose, when in some positions, of properly clearing the diverging -portions of the particular A-frame members 30 illustrated, although this offset might be avoided where the A-frame is differently proportioned.

The movements of each slide 84 are in turn governed by the position of the respective latch 81, which is drawn into engaging position, as shown in Fig. 8, under certain conditions and, as shown in Fig. 10, is moved away from the respective trip arm 80 into disengaging position under other conditions. This shift of the latch 81 is accomplished in each instance by means of a shift bar 94 pivoted upon a projecting portion near the upper end of one of the latch links 81a by means of a'pivot pin 95, the other end of each shift bar 94 being mountedV through the medium of a vslot 96 upon a stopstud 91 carried -by the respective lifting arm 85, the slot 96 caring for lost motion, as will be hereinafter described. As the respective lifting arm 65 is moved from its position illustrated in Fig. 8 to its position as illustrated in Fig. 10 and back to the position of Fig.' 8, the shift bar 94 causes the latch 81 to be moved to and from position to engage the shoulder 9|, the last portion of each of these movements being accomplished through the me- .dium of a snap action device 98 which also serves to retain the respective latch 81 in either of the indicated positions. The snap device 98 com- 'prises a coil spring 99 mounted around a rod |00 which carries at its upper end a boss |02 that is pivoted upon the respective link 81a opposite from that to which the respective shift bar 94 is pivoted. The boss |02 provides a seat for one end of the spring 99, the other end of the spring 99 being seated upon the projecting extremity of a finger |03 which is provided at that end with an aperture |04 through which the rod |00 extends, the finger 03 being rigidly secured at its other end to the lower end of the respective slide 84. The operation of these parts will be later described in detail.

For the purpose of manual operation, each lifting arm is provided with a laterally offset manipulating tongue |05 which projects sufficiently toward the operators seat to be accessible for the purpose. To facilitate the showing of the other parts and avoid confusion, this tongue |05 is shown only in part and only on the lifting arms of Fig. 2. The offset of each tongue |05 is suflicient to clear all operating parts, and its length is such only as to avoid contact with the tractor and other mechanisms.

' To facilitate plowing operations, a cutter, which is in the form shown a colter disk ||0, is positioned forward of the plows 34 and is adapted to be automatically adjusted from side to side so as to be aligned with the point of that plow 34 which is in lowered operative position. The colter disk ||0 in the form shown is pivotally carried on an axle supported in a fork ||2 welded upon the lower end of a vertical post H4 which is secured as by means of a set screw ||5 in the lower end of an upstanding hollow post I6 (Fig. 2) whose upper end is pivotally mounted 0n a pivot bolt ||1 (Fig. 3) between two fingers ||8 conveniently welded to adjacent portions of the A-frame members 30.

The lower portion of the post IIB at a position just below the transverse shaft 3| has secured thereto an angularly bent finger |20 which extends forward and whose extremity is bent upward along the forward side of the shaft 3| whereby to hold the post ||6 against the rear of the shaft 3| and thereby establish the fore and aft position of the colter disk ||0. For the purpose of laterally adjusting the disk |l0, a cam block |22 having opposite sloping sides |23 is mounted on the post H6. In the form shown the block |22 is an inverted frusto-conical member axially apertured to receive the post I i5 and adiustably mounted thereon as by a set screw |24. The sloping sides |23 are engaged by the The principal purposeof thefadjuStmenti-permitted bythe set screw |24'Lis. to-laiseaandllOWel the1cam block |22to permit .variation of the space betweenthetie 'v plates e 48 .f fand;thebeams 33 when it is desired to change` thefsizes-of the plows 31.- Such space variation-.is-made ppssible by using tubular spacers |25 von' theshait 3| yat the .ends of the tubes 45, these-spacersfbeingpositioned onl the middle of the shaft A3| betweenithe beams 33, or adjacent the .Ai-frame memberssil, as required for the purpose. The rearrangement is i readily accomplished by removing the shaft 3|.

The construction described is adapted. towbe used as a ditcher by lowering both` plows 34 into operating position, each of the jointed levers :64 thus Vserving as a meansvto brace Vits respective plow. This lowering of both plows may beaccomplished either by disconnectingone ot;- the cable clamps 69 orby disconnecting the pulley- 6| as Vbyremoving the cross bolt 63 fromthe A-frame members 353. Also, the shift `bars `fill are disconnected and the latches 81' moved manually to theirfprojected or inoperative position sothat theywi1l not eng-:age the shoulders-9| as the;

A-rame 26 is raised. In this condition, both plows may be lifted from the soil by-oonven-tional operation of the A-frame through' the medium ofthe hydraulic lift 25, 28, without actuation ofthe lifting arms65.

, Operation In .preparing the two-way plow of this invention for operation, the boltsli passing through thetie plate d8 and the retaining and bearing plates 42 and e4 are loosened so that theV respective plow beams 33 may be shiftedlaterally to provide for proper lateral adjustment of therespective plows 34, the boltsd .being then tightened. Similarly, the bolts `56 in the joints .40 are loosened so that the joint parts 52. may be respectively rotated to attaina desired .pitch of the respective plows 33. In order to` vary the suckf that is the depth, of draft or cut, `of the respective plows 31|,V the-bolts 69 are adjusted in the holes 'i2 in the lower ends-of` the sections 6l ofv the jointed levers 64,- the connectingcable 58 'being correspondingly adjusted `by means .of one of the clamps-6B.

Plowing will be commenced with one of. the,

plows in elevated, inoperative position andthe other in lowered, operative position, as illustrated inv both Figs. 1 andv 2. As theA tractor I6 is drawn forward, the operating plow ..34 ,throws a furrow in the corresponding direction.v Having reached the edge of the held, the operatingplow 34 is lifted from-the soil by actuation .of the hydraulic mechanism 28 under the controlofthe driver, the bell crank 25 working -throughthe lifting'links 24 serving to lift the Aframer-2|l through the medium of the arms I8. The previously operating plow having been suihciently lifted, the tractor is turned around to align the other plow in operative position, at whichlv time the operatorY further actuates the hydraulic mechanism 2S to continueelevation of'theeA- frame 20.

During preliminary movement of'the-A-frame 2e, the lifting arm 65 of the lowered plow. remains in its original bracing position,A thetwoplows 34 during that stage being. bodilyl elevated;.w ith out eiiecting operation of therespective elevator 8|. During this portion or". the movement. ofthe parts, slide 84 travels upward. along.;the-.head of the T-iron-forming the respectivettrip` arrrt.;

bar 94.

pression of theend-` 6519 ofthe corresponding lifting; arm flcausing thefarm -to. swing about its pivot bolt f 14,` thereby breaking the f jointed lever 64 at .itsgpivot |56'a-nd-causing-jitv to-A pass through thepositionishownfin 6 and- Agradually assume a position like that ofFig. 7 Dur-ing the elevationl oftheslide 84 andrits latch 81, the detent-.90 will have` been Ain engagement with the forward edge .of the trip --army8 by reason `of-having been previously drawn intoxthat position under the inuence of the respectiveshift arm A@Ji as-by a previous operation of themecha.- nsm, or by manual manipulation.

When elevation .off the frame `members f 30 of .the A-frarneli,v acting through the pivotrbolt 14', has, causedfthe respective lifting arm 65 `to assume the positionshown',in=Fig. 10, which, is the samerelative positionvof the lifting-` arm 65 andfofl its=linksection Blas vshown in Figsfz and .7; the shift bar-Sd-will ,have-assumedthe position with respect `tothepivot Ap inll by which the slide 84 is attachedto thefend -Bb-.of-the lifting arm 65 that is --illustrated in-Fig.4 1Q. Inasmuchas the attachment ofthe-shift-bar 94 to thelatch Slat the -pivot pin 95.*.is relatively close tog the pivot 88 which .mounts Y the-latch^3-`| upon; the; slide 84 in: each instance, the lower end of thelatch'! carrying. the -detent 98- is pushedpast its'dead` center position by the.. shift Having passed the dead center position, theI spring |03 then-acts-to push the-link 81 to the limit of thisdisengaging--movement, andthe sib-tsss in that end of the ,shirt par s4 which engages thefstop stud -91 cares `for the-resultant .lost motionoftheshit bartSd. As :long as'rthe lifting arm fmaintains theelevated position illustrated-iri-Fig; 10, the latch 81 remains Vdisengaged. Thus, when the `A-fra-rne- 20 is lowered after havingso-elevated 'a plow 341and itslifting arm 65, the frespcctive-fdetent .90 slides downward onits -triparmlill Vwith its slide Aftll but,` out of engagement with the respective trip armrll,y as isillustratedgingFig. '7, andl on a 4subsequent elevation,A of fthe/AY-frame 2|).I thedetent 90 .on the respectivelatch 81'will remain out. of* engagement untilthe respective lifting arm 65 has been moved fromv its elevated `position of Figs.V 2,v 6 and 10 to:V its:V lowered;A position, asdescribed below;

As. the A-frame Zfiselevatedby .the armsJ 8 upon theirfpivotsfl 9, the resultant swinging movementtends toJmovethe frame. 26 `toward the trip arms B. Due to the connection ofthe armends 65h to the slides t4, this movement isimparted s tothe arms- .which moveupon -their `pivots .83

vatwhich .time its jointed lever 64 yis straightened into -bracing position. Upon the descent .of a plow 34-.from the-elevatedv position toothelowered-operative position, the end oftherespective shift bar Y3ft-inf. engagement with its stop stud 91 Von thefrespective liftingarm 65.- is. gradually `connects the end 65h of the lifting arm S5 with the respective slide 84 until the various pivot points are substantially in a straight line, thereby representing the greatest distance between the Stop stud 97 and the pivot pin 95 on the latch 81. At approximately this position, which is generally illustrated in Fig. 8, the latch 81 is pulled by the shift bar 94 from its inoperative vposition shown in Figs. 7 and 10 toward the operative position indicated in Fig. 8. When the lower end of the latch 81 carrying the detent 9B passes the dead center position with respect to the spring 99 and its rod |00, the snap action ofthe spring 99 completes the movement into operative position shown in Fig. 8 and serves to retain the latch 81 in such operative position'.

After the latch 81 has been moved Ainto the operative position of Fig. 8 under the draft influence of the shift bar 94 and the snapl action of the spring 93, the slide 84 and the detent 90 continue their downward movement along the respective trip arm 8!) as the downward movement of the A-frame 2&3 continues. The slide 84 and the latch 81, together with its detent Sil, are thus in operative position ready to lift the lowered plow 34 and change the relation of the plows lupon the next upward excursion of the A-frame 20 under the inuence of the hydraulic lift mechanism 25, 28.

By means of the construction here disclosed, it is possible to plow by throwing adiacent Vfurrows in the same direction upon successive trips across a eld, the lchanging of the position of the two' plows being accomplished automatically in coniunction'with the normal operation of the hydraulic mechanism 28 by which the A-frame 20 is'raised and lowered when lifting the plows out of the soil.

' As each plow 34 is raised and the other plow 34 is simultaneously lowered by reason of the counterbalance connection through the cable 58, one edge of the tie plate 48 on the plow beam 33 being elevated engages the adjacent sloping side l23 ofthe cam block |22, thereby forcing the block |22, the post IIB, and the colter disk lll toward the other plow beam 33 whereby to align the colter disk H with the other plow 34. This shift of the block |22 and the post HB is permitted by reason of the fact that the other plow beam 33 and its tie plate 48 are descending along the sloping side |23 of the opposite side ofthe block |22. vInasmuch as the block |22 is adjustably mounted on the post H6 through the medium of the set screw |24, it is possible to vary the amount of shift to accommodate plows 34 of different sizes. This shift is permitted by removing the transverse supporting shaft 3| and interchanging the Ysmall spacers |25 accordingly.

Inasmuch as many modifications of the generic invention herein described and illustrated will become apparent to those skilled in the art, it is intended to cover allsuch variations as fall within the scope of the appended claims.

Wev claim as our invention:

1. A combination comprising: frame means; a pair of oppositely pitched plows movably carried by said frame means and adapted to be selectively lowered and raised to and from plowing position; lifting means connected with said plows to elevate the latter; trip means relatively movable with respect to said lifting means; and operative connections between said lifting means and both said frame means and saidrelatively movable trip means, one of said connections being bodily slidl0 able along said trip means and adapted to engage said trip means upon relative movement whereby to actuate said lifting means to raise a plow.

2. A combination as in claim 1 wherein said lifting means comprise lever means fulcrumed upon said frame means, said frame means normally assuming an upright position, and said trip means being in the form of upstanding means in approximate parallelism with said frame means. u

3. A combination as in claim 1 including shift means for shift of said one connection to and from operative position along said trip means as said lifting means changes position.

4. A combination as in claim 1 including power means to produce relative movement between said relatively movable trip means and said frame means and connected to actuate one of such means.

l5. In combination: frame structure; a pair of selectively movable so-il working tools movably carried by said frame structure and adapted to be selectively lowered and raised to and from soilworking positions; a pair of lifting means respectively connected with said tools for selectively elevating the latter; a structure relatively movable with respect to said lifting means; and individual operative connections between each of said lifting means and both said frame structure and said relatively movable structure, the individual connection for each lifting means being adapted to engage and actuate the respective lifting means upon relative movement of said structures whereby to raise the respective plow.

6. A combination according to claim 5 wherein said relatively movable structure comprises a pair of -upstanding trip means, and said individual connection for each lifting means is movable along the respective trip means to a trip position thereon for consequent actuation of the respective lifting means.

7. A combination as in claim 5 wherein shift means is included for each lifting means to shift the respective individual connection to and-from engaging position as the respective lifting means changes position.

8. A combination as in claim 5 ywherein said tools are interconnected whereby one tool is lowered as the other is raised.

9. A combination comprising: a frame structure; a trip structure with respect to which said frame structure is movable; a plurality of plows swingingly carried upon said frame structure and adapted to be lowered and raisedvto and from plowing position; a plurality of lifting means respectively connected with said plows for selectively elevating said plows, said lifting means individually having operative connections with both said frame structure and said trip structure;

means for moving one of said structures with' respect to the other for elevating said plows; and a plurality of movable elevator means individually connected with said lifting means and with one of said structures, said elevator means being reand raised bodily with said frame structure; a pair of lifting means respectively connected with said` plows for selectively elevating said plows with respect to said frame structure, each of said lifting means having operative connections with said frame structure and one 0f said trip arms; and movable elevator means connected with each of said lifting means and arranged for operative engagement by one of said trip arms, said elevator means being respectively adapted for relative movement to and from operating position for actuating said respective lifting means.

11. A combination according to claim 10 including means for shifting the respective elevator means to and from said operating position as said lifting means are respectively raised and lowered whereby said lifting means may be successively actuated.

12, In combination in a two-way plow structure: a frame; a pair of oppositely pitched plows movably carried by said frame and' adapted to be selectively lowered and raised to and from operative positions; means to move said frame vertically; lifting means for each of said plows supported on said frame and respectively connected with said plows; trip means with respect to which said frame is movable and associated with each of said lifting means and adapted to actuate said lifting means to raise and lower the respective plows selectively, whereby said vertical movement of said frame actuates the respective lifting means through engagement with its trip means; and means connected with said lifting means and relatively movable with respect tosaid trip means and adapted for automatic engagement with said trip means to cause the latter to' actuate the respective lifting means when the respective plow is in a lowered position.

13. A combination according to claim 12 including means on said relatively movable means whereby the latter is slidably guided on said trip means.

14. A combination according to claim l0 including means on said movable elevator means whereby the latter are slidably guided on the respective trip arms.

15. In combination: a frame structure; a pair of oppositely pitched plows pivotally carried upon said frame structure; means interconnecting said plows Iwhereby each plow is adapted to be lowl ered when the other is raised; lifting devices carried on said frame structure and respectively connected with said plows to raise and lower said plows with respect to said frame structure; means to raise and lower said frame structure and said plows bodily in a substantially vertical path; a trip mechanism for each of said lifting devices, each trip mechanism being adapted to trip its respective lifting device to raise a lowered plow with respect to said frame structure upon vertical movement of said structure; and actuating means for each trip mechanism rendering the respective trip mechanism inoperative when the respective plow is in elevated position and rendering said respective trip mechanism operative when the respective plow is lowered, said actuating means including an elevator, a shift bar connected with and actuated by the respective lifting device for moving said elevator to and from tripping position, and snap action means connected ywith said elevator for maintaining said elevator in either tripping position or inoperative position.

16. In combination in a plow structure: two oppositely pitched plows; a supporting framework; plow beams pivotally mounted upon said lil framework and carrying said plows for selective raising and lowering of said plows; means interconnecting said plows whereby one is raised as the. other is lowered; an auxiliary soil-penetrating tool disposed in advance of said plows and adapted to be shifted into selective alignment with said plows as said plows are respectively lowered; shifting means carried by said tool; cooperating shifting means respectively carried by said plow beams whereby said tool will be automatically shifted as said beams are respectively raised and lowered, certain of said shifting means being adjustable whereby to vary the amount of shift of said tool; and a verticalv post on the lower end of which said adjustable shifting means is mounted, said adjustable means being a frustoconical cam block through which said post extends and on whichv it is slidable.

17. In combination in a two-way plow: a frame; oppositely pitched plow means movably mounted on said frame and interconnected whereby one plow means is simultaneously lowered as the other plow means is raised; a pair of lifting arm members respectively connected with said plow means and pivoted upon said frame to raise said plow means selectively upon said frame; means to lift said frame and plow means bodily; a pair of trip members having means for mounting them on a tractive vehicle against substantial movement in the direction of lift of said frame and adapted to engage and actuate said lifting arm members respectively upon lift of said frame; latch means carried by each of the members of one of said pairs of members; and cooperating engaging means carried by each of the members of lthe other of said pairs of members to cooperate respectively with said latch means for lifting engagement to eiect actuation of said lifting arm members, said latch means being movable between engaging and non-engaging positions with respect to said engaging means as said lifting arm members move between different angular relationships with respect to said trip members.

18. A combination as in claim 17 including tensioning means connected to the respective latch means to hold such latch means selectively in each of said engaging and non-engaging positions.

19. In combination in a two-way plow: a frame adapted to be lifted bodily; oppositely pitched plow means movably mounted on said frame to be lifted therewith and interconnected whereby one plow means is lowered simultaneously with the raising of the other plow means; lifting arm members respectively connected with said plow means and pivoted upon said frame to raise said plow means selectively upon said frame; trip members having means for mounting them on a tractive vehicle against substantial movement in the direction of lift of said frame; shiftable engaging means carried by each of said lifting arm members; and cooperating engaging means carried by each of said trip members to cooperate respectively with said shiftable engaging means for lifting engagement therewith to effect actuation of said lifting arm members, said shiftable engaging means being movable between engaging and non-engaging positions Iwith respect to said cooperating engaging means as said lifting arm members move between different angular relationships with respect to said trip members.

20. A combination as in claim 19 including tensioning means connected to each of said shiftl able engaging means to hold such shiftable eneach of said plows for lowering and raising said l plows; a pair of sliding elevator means carried by the other of said assemblies and slidably movable vertically along said vertical members of said one of said assemblies and respectively connected with each of said lifting means; and trip means carried by said vertical members of said one of said assemblies to engage and actuate said elevator means, said lifting means being carried by one of said assemblies.

22. In combination: a frame structure; a pair of plows pivotally carried upon said frame structure, each plow being adapted to be lowered when the other is raised; lifting devices carried on said frame structure and respectively connected with said plows to raise and lower the latter upon said frame structure; means to raise and lower said frame structure and said plows bodily vertically; a trip mechanism for each of said devices, each trip mechanism being adapted to trip the respective lifting device to raise a lowered plow with respect to said frame structure upon vertical movement of said structure, said plows being interconnected to lower one plow as the other iS raised; means for each trip mechanism to render the respective trip mechanism operative when the respective plow is lowered; and means to render each trip member inoperative when the respective plow has been elevated.

HARRY ROGERS. WILLIAM FISK MELLEN.

14 REFERENCES CITED The following references are of record in the le of this patent:

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